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BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY, 
EXPLANATION OF THE PLATES. 
PLATE I. 
Dorocidaris panamensis A. Ag., from the abactinal side. 
. Dorocidaris panamensis A, Ag., from the actinal side. 
All figures natural size. 
PLATE Il 
Dorocidaris panamensis A. Ag., facing the odd anterior ambulacrum, 
. Salenia miliaris A. Ag., abactinal view. 
Salenia miliaris A. Ag., partly denuded. 
. Saienia miliaris A, Ag., facing the odd anterior ambulacrum. 
All figures natural size. 
PLATE II. 
Goniocidaris Doederleini A. Ag., from the abactinal side. 
Porocidaris Cobosi A. Ag., in profile. 
.Porocidaris Cobosi A. Ag., from the actinal side. 
Porocidaris Cobosi A. Ag., facing the posterior interambulacrum. 
Porocidaris Cobosi A. Ag., from the abactinal side. 
All figures natural size. 
PLATE IV. 
Porocidaris Milleri A. Ag., (female) test, seen from the abactinal side. 
Porocidaris Milleri A. Ag., from the actinal side, 
All figures natural size. 
PLATE V. 
Dialithocidaris gemmifera A, Ag., from the abactinal side. 
. Dialithocidaris gemmifera A. Ag., facing the odd anterior ambulacrum, 
. Dermatodiadema globulosum A. Ag., from the abactinal side. 
Dermatodiadema globulosum A. Ag., facing the odd anterior ambulacrum. 
Dermatodiadema horridum A. Ag., from the abactinal side. 
Dermatodiadema horridum A. Ag., in profile. 
. Dermatodiadema horridum A. Ag., facing the left anterior ambulacrum. 
All figures natural size. 
